Fabrication of Acetone Gas Sensor Based on Fe2O3 Decorated CNTs with Ag Interdigitated Electrodes on Al2O3 Substrate

Document Type : Original Article

Authors

1 Department of Electrical and Electronics Engineering, Shiraz University of Technology, Shiraz, Iran

2 Shiraz University of Technology, Shiraz, Iran

3 Modarres Blvd

Abstract

In this article, a resistive acetone gas sensor with high sensitivity is fabricated. A a two-stage thermal hydrolysis reaction has been used to synthesize the sensitive Carbon Nanotubes (CNTs) decorated with iron oxide nanoparticles (Fe2O3). Micro-scale silver Inter Digitated Electrodes (IDEs) made of silver have been deposited on alumina substrate which is resistant to high temperatures using optical lithography. The synthesis process includes functionalizing carbon nanotubes and then decorating them with iron oxide nanoparticles. The synthesized nanocomposite was characterized using X-ray diffraction and scanning electron microscopy. The results show that iron oxide nanoparticles uniformly decorated the surface of carbon nanotubes. The synthesized nanostructures were tested under different concentrations of acetone gas and showed appropriate response and high sensitivity. The fabricated sensor showed excellent selectivity, good reproducibility, and satisfactory response and recovery times. Decorating carbon nanotubes with iron oxide nanoparticles increases the sensitivity and speed of the sensor. The proposed sensor exposed to 100 ppm of acetone gas at a temperature of 300 degrees Celsius results in a resistance change of nearly 38 times. The improved sensor performance is mainly related to the material structure and the p-n junction between the CNTs and the iron oxide nanoparticles.

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TABRIZ JOURNAL OF ELECTRICAL ENGINEERING

Articles in Press, Corrected Proof
Available Online from 19 February 2024

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